Initial import

1 files changed, 162 insertions, 0 deletions

diff --git a/arch/arm/kernel/sleep.S b/arch/arm/kernel/sleep.S
new file mode 100644
index 000000000..7d37bfc50
--- /dev/null
+++ b/arch/arm/kernel/sleep.S
@@ -0,0 +1,162 @@
+#include <linux/linkage.h>
+#include <linux/threads.h>
+#include <asm/asm-offsets.h>
+#include <asm/assembler.h>
+#include <asm/glue-cache.h>
+#include <asm/glue-proc.h>
+	.text
+
+/*
+ * Implementation of MPIDR hash algorithm through shifting
+ * and OR'ing.
+ *
+ * @dst: register containing hash result
+ * @rs0: register containing affinity level 0 bit shift
+ * @rs1: register containing affinity level 1 bit shift
+ * @rs2: register containing affinity level 2 bit shift
+ * @mpidr: register containing MPIDR value
+ * @mask: register containing MPIDR mask
+ *
+ * Pseudo C-code:
+ *
+ *u32 dst;
+ *
+ *compute_mpidr_hash(u32 rs0, u32 rs1, u32 rs2, u32 mpidr, u32 mask) {
+ *	u32 aff0, aff1, aff2;
+ *	u32 mpidr_masked = mpidr & mask;
+ *	aff0 = mpidr_masked & 0xff;
+ *	aff1 = mpidr_masked & 0xff00;
+ *	aff2 = mpidr_masked & 0xff0000;
+ *	dst = (aff0 >> rs0 | aff1 >> rs1 | aff2 >> rs2);
+ *}
+ * Input registers: rs0, rs1, rs2, mpidr, mask
+ * Output register: dst
+ * Note: input and output registers must be disjoint register sets
+         (eg: a macro instance with mpidr = r1 and dst = r1 is invalid)
+ */
+	.macro compute_mpidr_hash dst, rs0, rs1, rs2, mpidr, mask
+	and	\mpidr, \mpidr, \mask			@ mask out MPIDR bits
+	and	\dst, \mpidr, #0xff			@ mask=aff0
+ ARM(	mov	\dst, \dst, lsr \rs0		)	@ dst=aff0>>rs0
+ THUMB(	lsr	\dst, \dst, \rs0		)
+	and	\mask, \mpidr, #0xff00			@ mask = aff1
+ ARM(	orr	\dst, \dst, \mask, lsr \rs1	)	@ dst|=(aff1>>rs1)
+ THUMB(	lsr	\mask, \mask, \rs1		)
+ THUMB(	orr	\dst, \dst, \mask		)
+	and	\mask, \mpidr, #0xff0000		@ mask = aff2
+ ARM(	orr	\dst, \dst, \mask, lsr \rs2	)	@ dst|=(aff2>>rs2)
+ THUMB(	lsr	\mask, \mask, \rs2		)
+ THUMB(	orr	\dst, \dst, \mask		)
+	.endm
+
+/*
+ * Save CPU state for a suspend.  This saves the CPU general purpose
+ * registers, and allocates space on the kernel stack to save the CPU
+ * specific registers and some other data for resume.
+ *  r0 = suspend function arg0
+ *  r1 = suspend function
+ *  r2 = MPIDR value the resuming CPU will use
+ */
+ENTRY(__cpu_suspend)
+	stmfd	sp!, {r4 - r11, lr}
+#ifdef MULTI_CPU
+	ldr	r10, =processor
+	ldr	r4, [r10, #CPU_SLEEP_SIZE] @ size of CPU sleep state
+#else
+	ldr	r4, =cpu_suspend_size
+#endif
+	mov	r5, sp			@ current virtual SP
+	add	r4, r4, #12		@ Space for pgd, virt sp, phys resume fn
+	sub	sp, sp, r4		@ allocate CPU state on stack
+	ldr	r3, =sleep_save_sp
+	stmfd	sp!, {r0, r1}		@ save suspend func arg and pointer
+	ldr	r3, [r3, #SLEEP_SAVE_SP_VIRT]
+	ALT_SMP(ldr r0, =mpidr_hash)
+	ALT_UP_B(1f)
+	/* This ldmia relies on the memory layout of the mpidr_hash struct */
+	ldmia	r0, {r1, r6-r8}	@ r1 = mpidr mask (r6,r7,r8) = l[0,1,2] shifts
+	compute_mpidr_hash	r0, r6, r7, r8, r2, r1
+	add	r3, r3, r0, lsl #2
+1:	mov	r2, r5			@ virtual SP
+	mov	r1, r4			@ size of save block
+	add	r0, sp, #8		@ pointer to save block
+	bl	__cpu_suspend_save
+	adr	lr, BSYM(cpu_suspend_abort)
+	ldmfd	sp!, {r0, pc}		@ call suspend fn
+ENDPROC(__cpu_suspend)
+	.ltorg
+
+cpu_suspend_abort:
+	ldmia	sp!, {r1 - r3}		@ pop phys pgd, virt SP, phys resume fn
+	teq	r0, #0
+	moveq	r0, #1			@ force non-zero value
+	mov	sp, r2
+	ldmfd	sp!, {r4 - r11, pc}
+ENDPROC(cpu_suspend_abort)
+
+/*
+ * r0 = control register value
+ */
+	.align	5
+	.pushsection	.idmap.text,"ax"
+ENTRY(cpu_resume_mmu)
+	ldr	r3, =cpu_resume_after_mmu
+	instr_sync
+	mcr	p15, 0, r0, c1, c0, 0	@ turn on MMU, I-cache, etc
+	mrc	p15, 0, r0, c0, c0, 0	@ read id reg
+	instr_sync
+	mov	r0, r0
+	mov	r0, r0
+	ret	r3			@ jump to virtual address
+ENDPROC(cpu_resume_mmu)
+	.popsection
+cpu_resume_after_mmu:
+	bl	cpu_init		@ restore the und/abt/irq banked regs
+	mov	r0, #0			@ return zero on success
+	ldmfd	sp!, {r4 - r11, pc}
+ENDPROC(cpu_resume_after_mmu)
+
+	.text
+	.align
+ENTRY(cpu_resume)
+ARM_BE8(setend be)			@ ensure we are in BE mode
+#ifdef CONFIG_ARM_VIRT_EXT
+	bl	__hyp_stub_install_secondary
+#endif
+	safe_svcmode_maskall r1
+	mov	r1, #0
+	ALT_SMP(mrc p15, 0, r0, c0, c0, 5)
+	ALT_UP_B(1f)
+	adr	r2, mpidr_hash_ptr
+	ldr	r3, [r2]
+	add	r2, r2, r3		@ r2 = struct mpidr_hash phys address
+	/*
+	 * This ldmia relies on the memory layout of the mpidr_hash
+	 * struct mpidr_hash.
+	 */
+	ldmia	r2, { r3-r6 }	@ r3 = mpidr mask (r4,r5,r6) = l[0,1,2] shifts
+	compute_mpidr_hash	r1, r4, r5, r6, r0, r3
+1:
+	adr	r0, _sleep_save_sp
+	ldr	r2, [r0]
+	add	r0, r0, r2
+	ldr	r0, [r0, #SLEEP_SAVE_SP_PHYS]
+	ldr	r0, [r0, r1, lsl #2]
+
+	@ load phys pgd, stack, resume fn
+  ARM(	ldmia	r0!, {r1, sp, pc}	)
+THUMB(	ldmia	r0!, {r1, r2, r3}	)
+THUMB(	mov	sp, r2			)
+THUMB(	bx	r3			)
+ENDPROC(cpu_resume)
+
+	.align 2
+_sleep_save_sp:
+	.long	sleep_save_sp - .
+mpidr_hash_ptr:
+	.long	mpidr_hash - .			@ mpidr_hash struct offset
+
+	.data
+	.type	sleep_save_sp, #object
+ENTRY(sleep_save_sp)
+	.space	SLEEP_SAVE_SP_SZ		@ struct sleep_save_sp